diff --git a/src/boards/ax40g.c b/src/boards/ax40g.c
new file mode 100644
index 0000000..87be2a7
--- /dev/null
+++ b/src/boards/ax40g.c
@@ -0,0 +1,94 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* NES 2.0 Mapper 527 is used for a bootleg version of
+ * Taito's 不動明王伝 (Fudō Myōō Den).
+ * Its UNIF board name is UNL-AX-40G. The original INES Mapper 207 is
+ * replaced with a VRC2 clone (A0/A1, i.e. VRC2b) while retaining
+ * Mapper 207's extended mirroring.
+ */
+
+#include "mapinc.h"
+
+static uint8 preg[2], creg[8], NT[2];
+
+static SFORMAT StateRegs[] =
+{
+	{ preg, 2, "PREG" },
+	{ creg, 8, "CREG" },
+	{ NT, 2, "NMT" },
+	{ 0 }
+};
+
+static void Sync(void) {
+	uint8 i;
+	setprg8(0x8000, preg[0]);
+	setprg8(0xA000, preg[1]);
+	setprg8(0xC000, 0x1E);
+	setprg8(0xE000, 0x1F);
+	for (i = 0; i < 8; i++)
+		setchr1(i << 10, creg[i]);
+	setmirrorw(NT[0], NT[0], NT[1], NT[1]);
+}
+
+static DECLFW(UNLAX40GWrite8) {
+	A &= 0xF003;
+	preg[0] = V & 0x1F;
+	Sync();
+}
+
+static DECLFW(UNLAX40GWriteA) {
+	A &= 0xF003;
+	preg[1] = V & 0x1F;
+	Sync();
+}
+
+static DECLFW(UNLAX40GWriteB) {
+	uint16 i, shift;
+	A &= 0xF003;
+	i = ((A >> 1) & 1) | ((A - 0xB000) >> 11);
+	shift = ((A & 1) << 2);
+	creg[i] = (creg[i] & (0xF0 >> shift)) | ((V & 0xF) << shift);
+	if (i < 2)
+		NT[i] = (creg[i] & 0x80) >> 7;
+	Sync();
+}
+
+static void UNLAX40GPower(void) {
+	Sync();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x8000, 0x8FFF, UNLAX40GWrite8);
+	SetWriteHandler(0xA000, 0xAFFF, UNLAX40GWriteA);
+	SetWriteHandler(0xB000, 0xEFFF, UNLAX40GWriteB);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void UNLAX40G_Init(CartInfo *info) {
+	info->Power = UNLAX40GPower;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}
+
+/*void UNLAX40G_Init(CartInfo *info);			// m527
+{ "AX-40G", UNLAX40G_Init, 0 },
+{ "JC-016-2", Mapper205_Init, 0 },
+*/
diff --git a/src/unif.c b/src/unif.c
index 68403a6..ebd60fa 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -494,6 +494,7 @@ static BMAPPING bmap[] = {
 	{ "900218", BTL900218_Init, 0 },
 
 	{ "JC-016-2", Mapper205_Init, 0 },
+	{ "AX-40G", UNLAX40G_Init, 0 },
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },
diff --git a/src/unif.h b/src/unif.h
index 93b3df8..6181f3b 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -179,6 +179,7 @@ void BMCK3036_Init(CartInfo *info);			/* m340 */
 void MINDKIDS_Init(CartInfo *info);			/* m268 */
 void UNLKS7021A_Init(CartInfo *info);		/* m525 */
 void BTL900218_Init(CartInfo *info);		/* m524 */
+void UNLAX40G_Init(CartInfo *info);			/* m527 */
 
 #ifdef COPYFAMI
 void MapperCopyFamiMMC3_Init(CartInfo *info);